/Engine/Source/Developer/AssetTools/Public/PackageMigrationContext.h
enum EPackageMigrationStep { BeginMigration, PostAssetMigrationPackageDataCreated, PostExternalMigrationPackageDataCreated, PostExcludedDependenciesCreated, InTheWayPackagesMoved, InstancedPackagesCreated, InstancedPackagesLoaded, InstancedPackagesSaved, PostCleaningInstancedPackages, InTheWayPackagesRestored, EndMigration, }